While its own saucer section receives repairs, the Enterprise tests a new experimental saucer that can, in theory, survive a crash landing on a planetary surface. Riker, Data, Worf, La Forge, and Starfleet's Admiral Nechayev will risk their lives to test this new sauce. But that dangerous test turns even more perilous when hostile forces seize control of the new saucer, and turn it against the Enterprise.